The framerate only gets "limited" to your monitor-frequency when V-Sync is turned ON. If it's OFF, it can go over. Still, I doubt many people their systems will pump out 50-60 frames per second at all times, especially when they're looking at mods like this. And in case of this technical wreck of a game it helps quite a lot to turn off V-sync. And if the tearing is troubling, you could try to let your videocard-settings to use Adaptive V-sync, which only turns on V-sync whenever it can afford to, and I really like that for bad performing games.